Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Marganay Formation

Marganay Fm

Period:

Proterozoic

Age Interval:

Neoproterozoic (PR₁? mr), R1

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

It is a marker in the section of the group. This is the lowest/third formation in the Alichur Gr.

Synonym: Marganayskaya Suite, Марджанайская свита

Reference section:

Lithology and Thickness

It is composed of marble para-gneisses clearly visible from a distance and marble-fossilized limestones, with subordinate layers of biotite, amphibole-biotite, and less often garnet-biotite schists. The thickness of the suite is 150-800 m. Usually light, with a yellowish hue, crushed marbles acquire a brown and dark gray color; they are intricately folded and contain lenses of schists and migmatites.

Lithology Pattern:

Gneiss

Relationships and Distribution

Lower contact

Schematic stratigraphic column indicates the lower contact as Ramaif Fm

Upper contact

Schematic stratigraphic column indicates the upper contact as Lyangar Fm

Regional extent

It is developed in the Southwestern Pamir- Rushan, Alichur, and Wakhan ranges.

GeoJSON

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Fossils

Age

Neoproterozoic

Age Span:

Beginning stage:

Tonian

Fraction up in beginning stage:

0.4

Beginning date (Ma):

888.00

Ending stage:

Tonian

Fraction up in the ending stage:

0.6

Ending date (Ma):

832.00

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Lakhsh district, 276.